I see your point. Star Wars hardly does time travel since it is not really sci-fi. However they always have that Jedi ghost stuff. I can see Luke Skywalker coming back as a ghost to warn our new Jedis of another intergalactic threat. Thankfully Vulcan’s like TOS Spock don’t need to be ghosts they just live longer and can use a black or worm hole to travel back in time and warn our space explorers of the same threat.

Another reason why I favour trek over wars at times, I tend to enjoy potential science hypothesis like worm/black holes brought to life in a sci—fi film than ghost and spirits running around.